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| Current File : //usr/src/sys/amd64/include/atomic.h |
/*-
* Copyright (c) 1998 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/sys/amd64/include/atomic.h 237161 2012-06-16 13:22:55Z kib $
*/
#ifndef _MACHINE_ATOMIC_H_
#define _MACHINE_ATOMIC_H_
#ifndef _SYS_CDEFS_H_
#error this file needs sys/cdefs.h as a prerequisite
#endif
#define mb() __asm __volatile("mfence;" : : : "memory")
#define wmb() __asm __volatile("sfence;" : : : "memory")
#define rmb() __asm __volatile("lfence;" : : : "memory")
/*
* Various simple operations on memory, each of which is atomic in the
* presence of interrupts and multiple processors.
*
* atomic_set_char(P, V) (*(u_char *)(P) |= (V))
* atomic_clear_char(P, V) (*(u_char *)(P) &= ~(V))
* atomic_add_char(P, V) (*(u_char *)(P) += (V))
* atomic_subtract_char(P, V) (*(u_char *)(P) -= (V))
*
* atomic_set_short(P, V) (*(u_short *)(P) |= (V))
* atomic_clear_short(P, V) (*(u_short *)(P) &= ~(V))
* atomic_add_short(P, V) (*(u_short *)(P) += (V))
* atomic_subtract_short(P, V) (*(u_short *)(P) -= (V))
*
* atomic_set_int(P, V) (*(u_int *)(P) |= (V))
* atomic_clear_int(P, V) (*(u_int *)(P) &= ~(V))
* atomic_add_int(P, V) (*(u_int *)(P) += (V))
* atomic_subtract_int(P, V) (*(u_int *)(P) -= (V))
* atomic_readandclear_int(P) (return (*(u_int *)(P)); *(u_int *)(P) = 0;)
*
* atomic_set_long(P, V) (*(u_long *)(P) |= (V))
* atomic_clear_long(P, V) (*(u_long *)(P) &= ~(V))
* atomic_add_long(P, V) (*(u_long *)(P) += (V))
* atomic_subtract_long(P, V) (*(u_long *)(P) -= (V))
* atomic_readandclear_long(P) (return (*(u_long *)(P)); *(u_long *)(P) = 0;)
*/
/*
* The above functions are expanded inline in the statically-linked
* kernel. Lock prefixes are generated if an SMP kernel is being
* built.
*
* Kernel modules call real functions which are built into the kernel.
* This allows kernel modules to be portable between UP and SMP systems.
*/
#if defined(KLD_MODULE) || !defined(__GNUCLIKE_ASM)
#define ATOMIC_ASM(NAME, TYPE, OP, CONS, V) \
void atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v); \
void atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v)
int atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src);
int atomic_cmpset_long(volatile u_long *dst, u_long expect, u_long src);
u_int atomic_fetchadd_int(volatile u_int *p, u_int v);
u_long atomic_fetchadd_long(volatile u_long *p, u_long v);
#define ATOMIC_LOAD(TYPE, LOP) \
u_##TYPE atomic_load_acq_##TYPE(volatile u_##TYPE *p)
#define ATOMIC_STORE(TYPE) \
void atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)
#else /* !KLD_MODULE && __GNUCLIKE_ASM */
/*
* For userland, always use lock prefixes so that the binaries will run
* on both SMP and !SMP systems.
*/
#if defined(SMP) || !defined(_KERNEL)
#define MPLOCKED "lock ; "
#else
#define MPLOCKED
#endif
/*
* The assembly is volatilized to avoid code chunk removal by the compiler.
* GCC aggressively reorders operations and memory clobbering is necessary
* in order to avoid that for memory barriers.
*/
#define ATOMIC_ASM(NAME, TYPE, OP, CONS, V) \
static __inline void \
atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
{ \
__asm __volatile(MPLOCKED OP \
: "=m" (*p) \
: CONS (V), "m" (*p) \
: "cc"); \
} \
\
static __inline void \
atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
{ \
__asm __volatile(MPLOCKED OP \
: "=m" (*p) \
: CONS (V), "m" (*p) \
: "memory", "cc"); \
} \
struct __hack
/*
* Atomic compare and set, used by the mutex functions
*
* if (*dst == expect) *dst = src (all 32 bit words)
*
* Returns 0 on failure, non-zero on success
*/
static __inline int
atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src)
{
u_char res;
__asm __volatile(
" " MPLOCKED " "
" cmpxchgl %2,%1 ; "
" sete %0 ; "
"1: "
"# atomic_cmpset_int"
: "=a" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"a" (expect), /* 3 */
"m" (*dst) /* 4 */
: "memory", "cc");
return (res);
}
static __inline int
atomic_cmpset_long(volatile u_long *dst, u_long expect, u_long src)
{
u_char res;
__asm __volatile(
" " MPLOCKED " "
" cmpxchgq %2,%1 ; "
" sete %0 ; "
"1: "
"# atomic_cmpset_long"
: "=a" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"a" (expect), /* 3 */
"m" (*dst) /* 4 */
: "memory", "cc");
return (res);
}
/*
* Atomically add the value of v to the integer pointed to by p and return
* the previous value of *p.
*/
static __inline u_int
atomic_fetchadd_int(volatile u_int *p, u_int v)
{
__asm __volatile(
" " MPLOCKED " "
" xaddl %0, %1 ; "
"# atomic_fetchadd_int"
: "+r" (v), /* 0 (result) */
"=m" (*p) /* 1 */
: "m" (*p) /* 2 */
: "cc");
return (v);
}
/*
* Atomically add the value of v to the long integer pointed to by p and return
* the previous value of *p.
*/
static __inline u_long
atomic_fetchadd_long(volatile u_long *p, u_long v)
{
__asm __volatile(
" " MPLOCKED " "
" xaddq %0, %1 ; "
"# atomic_fetchadd_long"
: "+r" (v), /* 0 (result) */
"=m" (*p) /* 1 */
: "m" (*p) /* 2 */
: "cc");
return (v);
}
/*
* We assume that a = b will do atomic loads and stores. Due to the
* IA32 memory model, a simple store guarantees release semantics.
*
* However, loads may pass stores, so for atomic_load_acq we have to
* ensure a Store/Load barrier to do the load in SMP kernels. We use
* "lock cmpxchg" as recommended by the AMD Software Optimization
* Guide, and not mfence. For UP kernels, however, the cache of the
* single processor is always consistent, so we only need to take care
* of the compiler.
*/
#define ATOMIC_STORE(TYPE) \
static __inline void \
atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
{ \
__asm __volatile("" : : : "memory"); \
*p = v; \
} \
struct __hack
#if defined(_KERNEL) && !defined(SMP)
#define ATOMIC_LOAD(TYPE, LOP) \
static __inline u_##TYPE \
atomic_load_acq_##TYPE(volatile u_##TYPE *p) \
{ \
u_##TYPE tmp; \
\
tmp = *p; \
__asm __volatile("" : : : "memory"); \
return (tmp); \
} \
struct __hack
#else /* !(_KERNEL && !SMP) */
#define ATOMIC_LOAD(TYPE, LOP) \
static __inline u_##TYPE \
atomic_load_acq_##TYPE(volatile u_##TYPE *p) \
{ \
u_##TYPE res; \
\
__asm __volatile(MPLOCKED LOP \
: "=a" (res), /* 0 */ \
"=m" (*p) /* 1 */ \
: "m" (*p) /* 2 */ \
: "memory", "cc"); \
\
return (res); \
} \
struct __hack
#endif /* _KERNEL && !SMP */
#endif /* KLD_MODULE || !__GNUCLIKE_ASM */
ATOMIC_ASM(set, char, "orb %b1,%0", "iq", v);
ATOMIC_ASM(clear, char, "andb %b1,%0", "iq", ~v);
ATOMIC_ASM(add, char, "addb %b1,%0", "iq", v);
ATOMIC_ASM(subtract, char, "subb %b1,%0", "iq", v);
ATOMIC_ASM(set, short, "orw %w1,%0", "ir", v);
ATOMIC_ASM(clear, short, "andw %w1,%0", "ir", ~v);
ATOMIC_ASM(add, short, "addw %w1,%0", "ir", v);
ATOMIC_ASM(subtract, short, "subw %w1,%0", "ir", v);
ATOMIC_ASM(set, int, "orl %1,%0", "ir", v);
ATOMIC_ASM(clear, int, "andl %1,%0", "ir", ~v);
ATOMIC_ASM(add, int, "addl %1,%0", "ir", v);
ATOMIC_ASM(subtract, int, "subl %1,%0", "ir", v);
ATOMIC_ASM(set, long, "orq %1,%0", "ir", v);
ATOMIC_ASM(clear, long, "andq %1,%0", "ir", ~v);
ATOMIC_ASM(add, long, "addq %1,%0", "ir", v);
ATOMIC_ASM(subtract, long, "subq %1,%0", "ir", v);
ATOMIC_LOAD(char, "cmpxchgb %b0,%1");
ATOMIC_LOAD(short, "cmpxchgw %w0,%1");
ATOMIC_LOAD(int, "cmpxchgl %0,%1");
ATOMIC_LOAD(long, "cmpxchgq %0,%1");
ATOMIC_STORE(char);
ATOMIC_STORE(short);
ATOMIC_STORE(int);
ATOMIC_STORE(long);
#undef ATOMIC_ASM
#undef ATOMIC_LOAD
#undef ATOMIC_STORE
#ifndef WANT_FUNCTIONS
/* Read the current value and store a zero in the destination. */
#ifdef __GNUCLIKE_ASM
static __inline u_int
atomic_readandclear_int(volatile u_int *addr)
{
u_int res;
res = 0;
__asm __volatile(
" xchgl %1,%0 ; "
"# atomic_readandclear_int"
: "+r" (res), /* 0 */
"=m" (*addr) /* 1 */
: "m" (*addr));
return (res);
}
static __inline u_long
atomic_readandclear_long(volatile u_long *addr)
{
u_long res;
res = 0;
__asm __volatile(
" xchgq %1,%0 ; "
"# atomic_readandclear_long"
: "+r" (res), /* 0 */
"=m" (*addr) /* 1 */
: "m" (*addr));
return (res);
}
#else /* !__GNUCLIKE_ASM */
u_int atomic_readandclear_int(volatile u_int *addr);
u_long atomic_readandclear_long(volatile u_long *addr);
#endif /* __GNUCLIKE_ASM */
#define atomic_set_acq_char atomic_set_barr_char
#define atomic_set_rel_char atomic_set_barr_char
#define atomic_clear_acq_char atomic_clear_barr_char
#define atomic_clear_rel_char atomic_clear_barr_char
#define atomic_add_acq_char atomic_add_barr_char
#define atomic_add_rel_char atomic_add_barr_char
#define atomic_subtract_acq_char atomic_subtract_barr_char
#define atomic_subtract_rel_char atomic_subtract_barr_char
#define atomic_set_acq_short atomic_set_barr_short
#define atomic_set_rel_short atomic_set_barr_short
#define atomic_clear_acq_short atomic_clear_barr_short
#define atomic_clear_rel_short atomic_clear_barr_short
#define atomic_add_acq_short atomic_add_barr_short
#define atomic_add_rel_short atomic_add_barr_short
#define atomic_subtract_acq_short atomic_subtract_barr_short
#define atomic_subtract_rel_short atomic_subtract_barr_short
#define atomic_set_acq_int atomic_set_barr_int
#define atomic_set_rel_int atomic_set_barr_int
#define atomic_clear_acq_int atomic_clear_barr_int
#define atomic_clear_rel_int atomic_clear_barr_int
#define atomic_add_acq_int atomic_add_barr_int
#define atomic_add_rel_int atomic_add_barr_int
#define atomic_subtract_acq_int atomic_subtract_barr_int
#define atomic_subtract_rel_int atomic_subtract_barr_int
#define atomic_cmpset_acq_int atomic_cmpset_int
#define atomic_cmpset_rel_int atomic_cmpset_int
#define atomic_set_acq_long atomic_set_barr_long
#define atomic_set_rel_long atomic_set_barr_long
#define atomic_clear_acq_long atomic_clear_barr_long
#define atomic_clear_rel_long atomic_clear_barr_long
#define atomic_add_acq_long atomic_add_barr_long
#define atomic_add_rel_long atomic_add_barr_long
#define atomic_subtract_acq_long atomic_subtract_barr_long
#define atomic_subtract_rel_long atomic_subtract_barr_long
#define atomic_cmpset_acq_long atomic_cmpset_long
#define atomic_cmpset_rel_long atomic_cmpset_long
/* Operations on 8-bit bytes. */
#define atomic_set_8 atomic_set_char
#define atomic_set_acq_8 atomic_set_acq_char
#define atomic_set_rel_8 atomic_set_rel_char
#define atomic_clear_8 atomic_clear_char
#define atomic_clear_acq_8 atomic_clear_acq_char
#define atomic_clear_rel_8 atomic_clear_rel_char
#define atomic_add_8 atomic_add_char
#define atomic_add_acq_8 atomic_add_acq_char
#define atomic_add_rel_8 atomic_add_rel_char
#define atomic_subtract_8 atomic_subtract_char
#define atomic_subtract_acq_8 atomic_subtract_acq_char
#define atomic_subtract_rel_8 atomic_subtract_rel_char
#define atomic_load_acq_8 atomic_load_acq_char
#define atomic_store_rel_8 atomic_store_rel_char
/* Operations on 16-bit words. */
#define atomic_set_16 atomic_set_short
#define atomic_set_acq_16 atomic_set_acq_short
#define atomic_set_rel_16 atomic_set_rel_short
#define atomic_clear_16 atomic_clear_short
#define atomic_clear_acq_16 atomic_clear_acq_short
#define atomic_clear_rel_16 atomic_clear_rel_short
#define atomic_add_16 atomic_add_short
#define atomic_add_acq_16 atomic_add_acq_short
#define atomic_add_rel_16 atomic_add_rel_short
#define atomic_subtract_16 atomic_subtract_short
#define atomic_subtract_acq_16 atomic_subtract_acq_short
#define atomic_subtract_rel_16 atomic_subtract_rel_short
#define atomic_load_acq_16 atomic_load_acq_short
#define atomic_store_rel_16 atomic_store_rel_short
/* Operations on 32-bit double words. */
#define atomic_set_32 atomic_set_int
#define atomic_set_acq_32 atomic_set_acq_int
#define atomic_set_rel_32 atomic_set_rel_int
#define atomic_clear_32 atomic_clear_int
#define atomic_clear_acq_32 atomic_clear_acq_int
#define atomic_clear_rel_32 atomic_clear_rel_int
#define atomic_add_32 atomic_add_int
#define atomic_add_acq_32 atomic_add_acq_int
#define atomic_add_rel_32 atomic_add_rel_int
#define atomic_subtract_32 atomic_subtract_int
#define atomic_subtract_acq_32 atomic_subtract_acq_int
#define atomic_subtract_rel_32 atomic_subtract_rel_int
#define atomic_load_acq_32 atomic_load_acq_int
#define atomic_store_rel_32 atomic_store_rel_int
#define atomic_cmpset_32 atomic_cmpset_int
#define atomic_cmpset_acq_32 atomic_cmpset_acq_int
#define atomic_cmpset_rel_32 atomic_cmpset_rel_int
#define atomic_readandclear_32 atomic_readandclear_int
#define atomic_fetchadd_32 atomic_fetchadd_int
/* Operations on 64-bit quad words. */
#define atomic_set_64 atomic_set_long
#define atomic_set_acq_64 atomic_set_acq_long
#define atomic_set_rel_64 atomic_set_rel_long
#define atomic_clear_64 atomic_clear_long
#define atomic_clear_acq_64 atomic_clear_acq_long
#define atomic_clear_rel_64 atomic_clear_rel_long
#define atomic_add_64 atomic_add_long
#define atomic_add_acq_64 atomic_add_acq_long
#define atomic_add_rel_64 atomic_add_rel_long
#define atomic_subtract_64 atomic_subtract_long
#define atomic_subtract_acq_64 atomic_subtract_acq_long
#define atomic_subtract_rel_64 atomic_subtract_rel_long
#define atomic_load_acq_64 atomic_load_acq_long
#define atomic_store_rel_64 atomic_store_rel_long
#define atomic_cmpset_64 atomic_cmpset_long
#define atomic_cmpset_acq_64 atomic_cmpset_acq_long
#define atomic_cmpset_rel_64 atomic_cmpset_rel_long
#define atomic_readandclear_64 atomic_readandclear_long
/* Operations on pointers. */
#define atomic_set_ptr atomic_set_long
#define atomic_set_acq_ptr atomic_set_acq_long
#define atomic_set_rel_ptr atomic_set_rel_long
#define atomic_clear_ptr atomic_clear_long
#define atomic_clear_acq_ptr atomic_clear_acq_long
#define atomic_clear_rel_ptr atomic_clear_rel_long
#define atomic_add_ptr atomic_add_long
#define atomic_add_acq_ptr atomic_add_acq_long
#define atomic_add_rel_ptr atomic_add_rel_long
#define atomic_subtract_ptr atomic_subtract_long
#define atomic_subtract_acq_ptr atomic_subtract_acq_long
#define atomic_subtract_rel_ptr atomic_subtract_rel_long
#define atomic_load_acq_ptr atomic_load_acq_long
#define atomic_store_rel_ptr atomic_store_rel_long
#define atomic_cmpset_ptr atomic_cmpset_long
#define atomic_cmpset_acq_ptr atomic_cmpset_acq_long
#define atomic_cmpset_rel_ptr atomic_cmpset_rel_long
#define atomic_readandclear_ptr atomic_readandclear_long
#endif /* !WANT_FUNCTIONS */
#endif /* !_MACHINE_ATOMIC_H_ */